The extended constructs of technology acceptance model (TAM) have rarely been linked to psychological influence factors. This study complements for the missing link in literature through structural equation modeling and a nonparametric Mann-Whitney U test based on the data obtained from a large-scale questionnaire survey. It is concluded that (a) conformity behavior can be integrated into the TAM to establish a fit model in WeChat use in language learning at the significance level 0.05, (b) self-esteem can be integrated into the TAM to establish a fit model in WeChat use in language learning at the significance level 0.05, and (c) there are no significant gender differences in the extended constructs in the TAM in WeChat use in language learning at the significance level 0.05. Future research may extend the constructs further in psychology in order to complement for missing links in current literature. It is also promising to establish a sociocultural TAM with respect to mobile device acceptance in both western and eastern contexts.